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When people call up Leigh Jerrard, founder of Greywater Corps, they're greeted with a recorded message: "Note that we are overwhelmed with inquiries right now, so it may be a while before we get back to you. But have faith."

Jerrard's company helps homeowners with the complicated process of installing their own Greywater systems. The system takes drainage from showers or washing machines and uses it to water lawns.

It sounds like a great idea now but six years ago, when Jerrard started the company, few people were interested.

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Air pollution comes from many sources — power plants, industrial production and fires, to name a few. In Pittsburgh, the most polluted city east of California, according the American Lung Association, avoiding dirty air while outdoors can be difficult, if not impossible. But a new device, available through the public library system, helps people identify and reduce bad air quality inside their homes.

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